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DNA-only Transposons

DNA-only Transposons

DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...

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Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

Published on: September 11, 2017

A modified universal fast walking method for single-tube transposon mapping.

Kyl V Myrick¹, William M Gelbart

¹Department of Molecular and Cellular Biology, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts 02138, USA. kvmyrick@mcb.harvard.edu

Nature Protocols

|June 16, 2007

Summary

A new universal fast walking (UFW) method simplifies transposon mapping by using agarase, eliminating cloning steps. This automatable, single-vessel protocol provides high yields and quality assurance for rapid genomic analysis.

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Area of Science:

Molecular Biology
Genomics

Background:

Genome walking methods are crucial for identifying DNA sequences flanking known regions.
Traditional methods like inverse PCR often require multiple steps, including molecular cloning, restriction enzymes, and ligases, which can be time-consuming and inefficient.

Purpose of the Study:

To describe an enhanced universal fast walking (UFW) method optimized for transposon mapping.
To present a streamlined protocol that avoids traditional molecular cloning and enzymatic steps.

Main Methods:

The enhanced UFW protocol integrates agarase to resolve complex nucleotide sequences.
It employs a single reaction vessel with a constant enzyme buffer for automatable chemistry.
Key steps include first-strand synthesis, primer destruction, primer annealing, end repair, lariat formation, and amplification.

Main Results:

The method eliminates the need for restriction enzymes and ligases, reducing experimental complexity.
It achieves high yields comparable to direct PCR due to minimal template loss.
The protocol is rapid, completed in half a day or less, and offers quality assurance through intrinsic DNA fingerprints.

Conclusions:

The enhanced UFW method provides an efficient and rapid approach for transposon boundary retrieval.
This protocol is versatile and applicable to general genome walking, cDNA walking, and mapping of viral or other insertional elements.